Dissociation constants of the carboxyl group of xanthene dyes in the ground and excited states

A new rhodamine based chemodosimeter for Ni2+ with high sensitivity and selectivity

“…S1 †), indicating that Rha-py partially existed in zwitterion form. 9 And the uorescence of the probe was weak, which is presumably caused by the effect of photo-induced electron transfer (PET) from adjacent electron-donating amine on its benzyl carboxylate structure. 10 In the meanwhile, the thermal dissipation of excitation energy of the probing molecule by strong H bonding with water is another reason for the weak uorescence.…”